| 摘要 |
An input resonance circuit of a tuner is provided to improve receive sensitivity of the first band(UHF(UltraHigh Frequency)) in selecting UHF. A UHF input resonance circuit(31) inputs/tunes the first band(UHF) from an RF(Radio Frequency) signal received through an HPF(High Pass Filter) from an antenna(ANT). An IF(Intermediate Frequency) trap unit(30) removes only an IF signal from the RF signal received through the HPF from the antenna(ANT). High and low VHF input resonance circuits(32,33) input/tune the second band(VHF(Very High Frequency)) from the RF signal outputted from the IF trap unit(30). A switching circuit(34) lowers an output level of the second band outputted when the first band is selected at the IF trap unit(30). The switching circuit(34) is provided between the IF trap unit(30) and the VHF input resonance circuit(32).
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